I'm wondering if this bug describes the problem of the hyphenation language not being stored at all?

If I change the hyphenation language under Document setup -> Hypenator to "Dutch" it has switched back after using the hyphenator. And indeed, while using the hyphenator it seems to suggest English hyphenation all the time, in stead of Dutch.

This is quite a grave bug, since it requires me to manually hyphenate _all_ texts in my booklet, which is just impossible. Especially since corrected hyphenation suggestions are not stored at all. Quite a show stopper!